Wasn't sure where to post this question, so please let me know if this is the wrong place!

I'm a very happy user of the Plex for Kodi add-on inside MrMC, on an Apple TV 4K. It works pretty much flawlessly - really amazing job all involved!

However, one problem I do run into occasionally is files being transcoded on my Plex Server when I'm sure they don't need to be. Most of my content Direct Plays just fine, including 4K HEVC content with 7.1 audio. But every so often I get a file thats, e.g. 1080p H264 with AC3 audio, and Plex decides to transcode that 3 ways, from MP4 to MKV, from H264 to H264, and from AC3 to AAC.

I'm not entirely sure which bits of the Plex server log are most useful to help debug this, but here's some things that might be relevant: